"Over a third of the Fortune 100 and many of the most successful and innovative web companies rely on MongoDB. "

taken from their page : https://www.mongodb.com/mongodb-scale

This should give people some insight on why MongoDB is being used in the industry.

thats an old stat - its over 50% of the Fortune 100 now

You could replace the word MongoDB to "some crap C code from 20 years ago" but it wouldn't make you want to have it.

MongoDB wins on performance, big time.

https://www.amon.cx/blog/rethinkdb-reviewed-by-a-mongo-fan/

A database that doesn't need to guarantee data integrity will always be faster.

How is the performance with the new v1 protocol? (still faster, I'm sure)

Sorry if this is a stupid question. But how important is guaranteed integrity, in practice? (BTW, is what you're referring to considered transactions?) Obviously, for things like banking you need guarantees, but I'm not sure how often reads/writes to mongodb just disappear out of thin air.

>but I'm not sure how often reads/writes to mongodb just disappear out of thin air.

Which would imply you have to restore from backups continuesly. Or else any bug you run into might be the result of data corruption.

Its the fact that you cant even tell. And its not just about loosing data. If you rely upon a consistent world view (i.e. schedule payment, jobs scheduling, vms provision or shipping, account systems) the risk is unacceptable.

Is there anything like mlab.com for RethinkDB? I don't want to manage my own server.

There is https://www.compose.com/rethinkdb

Is RethinkDB even actively developed anymore? I saw they closed up not too long ago.

Yes. Development is very active.

https://rethinkdb.com/blog/rethinkdb-joins-linux-foundation/